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Leinonen is outraged by the surprise appearance of the father of her son's killer at Democratic presidential nominee Hillary Clinton's event Monday night in Kissimmee.

Clinton talked about the massacre at the Pulse nightclub June 12, saying, “I know how many loved ones and friends are still grieving.”

Clinton was talking about pushing for legislation to change gun laws, to prevent those known or suspected terrorists from purchasing firearms and preventing those with mental health issues from being able to possess a firearm.

Leinonen told WESH 2 News that even if Mateen favors Clinton and her promise of tougher gun control laws, his appearance there was grossly insensitive.

“Hillary Clinton is someone who my son supported. My son was murdered by his son. He raised his son to the exact contradiction to the way I raised my son," Leinonen said.

After the event, Mateen talked about his son, saying, “I wish that my son joined the Army and fought ISIS and destroyed ISIS. That would be much better.”

Mateen also said he was "invited by the Democratic Party."

The Clinton campaign responded this way: “The rally was a 3,000-person, open-door event for the public. This individual wasn't invited as a guest and the campaign was unaware of his attendance until after the event."

"As we move forward in our time of grief and try and get back to normalcy, commenting on this does nothing for our hearts as we try and move forward," said Ryan Connell, the brother of Pulse victim Cory Connell.

According to the Florida Democratic Party, Mateen's father is not on any current email list for campaign events and there is no coordinated effort to have him appear with candidates.